Category Archives: Peregrines

While Ecco Courts, Carla Checks the Sky

Ecco and Carla court at the Pitt peregrine nest, 2 Feb 2024 (photo from the National Aviary snapshot camera)

7 February 2024

Courtship season is underway at the Pitt peregrine nest where Ecco and his mate Carla are cementing their pair bond. Apparently they are not the only peregrines in the area.

On 26 January I received news from Charles Bier who was instrumental in establishing the peregrine nestboxes at Gulf Tower and Pitt. Charles saw a pair in East Liberty.

I happened to be in East Liberty on this past January 12th, and I happened to notice 2 peregrines flying into the top of the East Liberty Presbyterian Church.  One of the birds landed high on the church tower and the other one did, or flew behind the tower at the same altitude.  I do not know that this was a “pair”, but they were behaving within that context, and at this time of the year they would be focusing on high ledges. 

So, I am wondering if a pair is known to be using this church, or if possibly it could have even been the Cathedral of Learning pair having a lunchtime outing to East Liberty.  I quickly measured out  the direct distance between the CoL and this church in East Liberty and it came out to about 1.9-miles.  Back in the day, this distance would have been regarded as too close for comfort; re: 2 pairs in close proximity (that was an initial concern for the Gulf Tower and CoL pairs, which were about 2.3-miles apart).  In any case, there are many factors involved and I doubt this distance would be a problem for them.

— email from Charles Bier, 26 January 2024

I replied that the Pitt peregrines generally stay close to home to defend their territory at this time of year, so maybe it’s a new pair.

Then, outside my window on Sunday 4 February, I saw a peregrine flying hard toward Shadyside from the direction of the Cathedral of Learning. This falcon was using territorial flappy flight to make itself obvious as it approached another peregrine of the same size — likely both females — circling up in the vicinity of Negley Avenue and Baum Boulevard. This intersection is about halfway between the Cathedral of Learning and East Liberty Presbyterian Church. It might be a boundary line.

The peregrines did not fight. Instead they both circled up apart from each other and went their separate ways.

This is the time of year when peregrines with a less than satisfactory nest site try to claim a better one. The Cathedral of Learning is the best site in town and Carla is new there(*) so of course the challengers are testing to see if she’s up to snuff.

Perhaps that explains why she was so distracted while Ecco was courting her on Saturday 3 February. Though the courtship session lasted 6 minutes, Carla spent 3 minutes looking at the sky. To save you time, I chopped out those (boring) three minutes with a fade.

Ecco and Carla courting at the Pitt peregrine nest, 3 Feb 2024 (video from the National Aviary falconcam at Univ of Pittsburgh)

Has the territorial boundary been settled? Are there challengers on the horizon?

Keep up with all the action on the National Aviary Falconcam at the University of Pittsburgh.

(*) Carla arrived at the Cathedral of Learning in late May last year. She was banded Black/Blue S/07 at her birthplace in Fort Wayne, Indiana in May 2020.

The New Pitt Falconcam is Live!

Ecco and Carla touch beaks as they bow at the Pitt peregrine nest, 5 Jan 2024 (image from the National Aviary falconcam at Univ of Pittsburgh)

1 February 2024

Today the National Aviary’s new peregrine falconcam at the Cathedral of Learning has begun live streaming for the 2024 nesting season.  If you’ve followed the stream in prior years you’ll find that this new camera is great for watching Ecco and Carla as they court and raise a family. Click here and scroll down to watch.

Last September the 10 year old camera died after limping for years with a broken microphone and infrared light. It took us a while to notice (no one was watching) so the timing was fortunate. We had three months to get advice on cameras, choose a model, install it and learn how to use it before streaming began.

Long time peregrine fan Kim Getz coordinated the project for Pitt I.T. and it all came together on installation day. Lighthouse Electric removed the old equipment, ran wires, and installed the new microphone and camera. Kim volunteered to clean the nestbox and re-secure the green perches with zip ties. She gives a thumbs up to the snapshot camera when she’s done. Thankfully the peregrines did not harass the crew.

The new camera is quite an improvement over the old one with sharper focus, better reach, and of course audio and infrared night light. The nest view is narrower because it’s a tight space and this camera is about 2 inches closer due to the length of the wall mount arm. (All the new cameras have longer arms nowadays.)

Though we cannot change the camera view when the adult peregrines are present — it spooks them! — the presets in the slideshow below will come in handy when the young explore the gully, the nestrail, and the nestbox roof. The slides begin with Ecco preening on the green perch. Kim ran the camera through its paces when no peregrines were around.

What can we expect on camera this season? Last year was a disappointment with no peregrine eggs and chicks because the female, Morela, became egg bound and died in mid May. Two days after Morela disappeared a banded female peregrine, Carla (Black/Blue S/07, Fort Wayne, IN, 2020), arrived on site and has been there ever since. Late May was too late to nest in 2023 so this year will be Carla’s first nesting season.

Carla and Ecco have been courting and bowing since they met last year and are intensifying their attachment this winter. They bowed and touched beaks last month in these snapshots taken before streaming began. When you watch them in full screen you’ll see tiny bones on the gravel and be able to read Carla’s bands.

Thank You to everyone who helped make this project a success, especially …

  • The National Aviary and their Ornithologist Bob Mulvihill, whose commitment to broadcasting the Pitt peregrines’ nest has provided us with a new camera.
  • Pitt I.T. who assigned Kim Getz to manage the project and provided additional tech assistance. Kim’s knowledge, dedication, and connections within the University made everything flow smoothly.
  • Pitt’s Dietrich School of Arts & Sciences, Department of Biological Sciences and Rory Carroll, sponsors of the falconcam within the University.
  • Charles Eldermire at Cornell Bird Cams for advice on camera models and Cornell’s experience with their features.

Click here and scroll down to watch the National Aviary Falconcam at the Cathedral of Learning.

It’s Peregrine Season!

p.s. For those of you following my southern Africa trip, today is the day I leave Africa on a 33.5 hour journey home (flights + layovers). I am spending most of my time in the upper troposphere.

Pitt Peregrines: A Look Back at 2023

Ecco and Carla bow at the nest 18 May 2023 (photo from the National Aviary falconcam at Univ of Pittsburgh)

14 January 2024

As we anticipate peregrine nesting season at University of Pittsburgh’s Cathedral of Learning, let’s take a look back at last year’s highlights. Well actually “low lights.” The nest was not successful last year but the reason why gives us hope for great things for 2024.

Pitt Peregrine Highlights in 2023 (click the links for more detail)

The year began at the Cathedral of Learning with Ecco and Morela, the resident male and female. We hoped for a first egg around St. Patrick’s Day, 17 March.

In early February Morela seemed distracted, obviously checking the sky during a courtship session on the 6th. The distraction continued.

Morela is distracted while Ecco tries to court her, 6 Feb 2023 (photo from the National Aviary snapshot camera at Univ of Pittsburgh)

By 21 March Morela had not laid an egg, yet she disappeared for four days so I wondered if there was a female challenger for the nest. When Morela returned on 25 March the intruder did not stay away. For 4-5 weeks Morela tried without success to lay an egg.

Morela looks ready to lay an egg, 23 April 2023, 6:18am (from the National Aviary falconcam at Univ of Pittsburgh)

By May Morela was egg bound and increasingly ill. She disappeared forever on 12 May.

Morela looks ill at Pitt peregrine nest, 8 May 2023 5:34pm (photo from the National Aviary falconcam at Univ of Pittsburgh)

On 14 May a banded female peregrine, new to the Cathedral of Learning, showed up on camera. Carla hatched at the Indiana Michigan Power Center (IMPC) Building in Fort Wayne, Indiana in 2020 and flew here on her own. Carla was named when she was banded (Black/Blue S/07).

Though it was too late to start a family in late May, Carla and Ecco have strengthened their pair bond ever since. This 4 minute video from 30 July, sped up to double-time, shows the pair bowing for an extended period. Notice that there was no sound on the video last year. I promise there will be sound this year!

video from the National Aviary falconcam at Univ of Pittsburgh, 30 July 2023

Carla will nest for the first time this spring as we watch her on the National Aviary’s Falconcam that will begin streaming on 1 February.

Until the stream begins, view the nest from the CL snapshot page and get in practice ahead of time. Click here to learn how to tell Carla and Ecco apart.

(photos from the National Aviary falconcam at Univ of Pittsburgh)

(credits are in the captions)

Remembering a Snowy Winter

Snowy owl at Presque Isle State Park, 29 Nov 2013 (photo by Shawn Collins)

7 January 2024

It’s been 10 years since the spectacular winter of 2013-2014 when snowy owls irrupted in the Lower 48 States. That winter they invaded the Northeastern U.S. and traveled as far south as coastal North Carolina, Florida and Bermuda!

This year a few snowies are visiting the Great Lakes region but the only concentration of owls is in western Canada. You can see the difference in their eBird sightings in these maps of 2013-2014 versus 2023-2024. (Click here to see the eBird Explore map.)

In 2013-2014 there were so many snowy owls that photographers often saw peregrine falcons attacking them. Steve Gosser captured this still shot at Presque Isle State Park in December 2013.

Peregrine falcon attacking snowy owl at Gull Point, Erie, PA, 1 Dec 2013 (photo by Steve Gosser)

Tom Johnson filmed two peregrines harassing snowy owls at Stone Harbor, New Jersey in January 2014.

Peregrines attack snowy owls at Stone Harbor, NJ in Jan 2014 (Video embedded from Cornell Lab on YouTube)

It was also a snowy weather winter. 2013-2014 was very cold with enduring snow on the ground because of the “Polar Vortex.”

This year is much warmer — so much so that yesterday’s snow melted overnight, as seen at the Pitt peregrine nestbox.

Snow melted overnight in Pittsburgh: 6 Jan 2024 afternoon vs 7 Jan morning (via the National Aviary’s snapshot camera)

This winter we’re missing both snowies and snow.

(credits are in the captions)

Celebrating My Favorite Bird on National Bird Day

Dorothy at the Cathedral of Learning on Banding Day, 17 May 2013 (photo by Peter Bell)

5 January 2024

My Audubon calendar had a surprise for me this morning. Today is National Bird Day, a little-known celebration established in 2002 by BornFreeUSA in coordination with the Avian Welfare Coalition. Since both organizations focus primarily on the well being of captive animals and birds, the celebration has not gained much notice in the birding community. However it’s a great excuse to celebrate my own favorite bird.

The peregrine falcon pictured above is the only wild bird I’ve ever been able to recognize and learn as an individual. Dorothy arrived at the University of Pittsburgh’s Cathedral of Learning in 2001 at age 2 and had her first successful nest in 2002, the year that National Bird Day was established.

As I got to know Dorothy I learned about her species and became addicted to peregrines. She also taught me a lot about herself and in retrospect the unique characteristics of her generation, the peregrines that repopulated eastern North America.

Dorothy died eight years ago and still is in my heart, especially as nesting season approaches. Here’s a look back at what a great bird she was. Never captive. Always wild.

How Do Peregrines Increase Accuracy? Fly Faster!

Gusto heads into a stoop, 9 Feb 2022 (photo by Chad+Chris Saladin)

3 December 2023

Peregrines are the fastest animal on earth when they dive at 200 mph to catch their prey in flight. In fact they dive even faster when they’re hunting an evasive bird. The higher speed increases turning force so they’re more accurate at catching prey.

In 2005 Ken Franklin went sky diving with a peregrine to clock its maximum freefall speed at 242 mph (389 km/hr).  In 2018 scientists wanted to study the details of the peregrines’ dive, but it was too hard to do in real time, so they created 3D simulations of a stooping peregrine pursuing a European starling.

The simulations showed that optimal speed for catching a bird in straight flight is 93 mph but if the prey is zig-zagging in the sky the best speed is 225 mph.

You’d think that the higher attack speeds would make it more difficult for falcons to adjust to a moving target. But the opposite turned out to be true: The predators were more maneuverable at higher speeds because they could generate more turning force; only then were they able to outmaneuver the highly agile starlings. So stoops don’t just help falcons quickly overtake prey—they also help the predators change directions.

Science Magazine: Peregrine falcons maneuver best when dive-bombing at more than 300 kilometers per hour

Watch how it works in this video from Science Magazine. You’ll need these equivalents as you watch.

  • 300 km/hr = 186 mph
  • 150 km/hr = 93 mph
  • 360 km/hr = 223+ mph. I rounded up to 225 mph
video from Science Magazine on YouTube

Can You Spot the Peregrine?

Stirring up the pigeons in Cleveland, 2017 (photo by Chad+Chris Saladin)

17 November 2023

Can you spot the peregrine?

When peregrines are hungry, the birds they’d like to eat flock tightly and move as fast as they can. The denser the flock the harder it is for the peregrine to pick out a solo bird to catch for dinner.

In the photo above pigeons are flying crosswise to avoid an oncoming peregrine. Can you spot the peregrine in the picture?

Dunlin (Calidris alpina) are masters of tight flocking and evasive maneuvers when threatened from the air. In the video below by Pacificnorthwestkate (@pnwkate) the dunlin move like a murmuration of starlings as a peregrine harasses them. Can you spot the peregrine?

embedded video by Pacificnorthwestkate on YouTube

Notice how the dunlin flock winks off and on in the video, dark at one moment then so white they disappear. In winter plumage dunlin have brown-gray backs and white bellies. The flock changes color as the birds turn in unison in the air.

Dunlin in winter plumage (photo from Wikimedia Common)

Last month I wrote about peregrines’ winter strategy for catching dunlin: Peregrines Are Just Tiring Them Out.

(credits are in the captions)

Peregrines Are Just Tiring Them Out

Peregrine falcon looking for a meal (photo from Wikimedia Commons)

13 October 2023

When peregrine falcons migrate down the Pacific Coast in autumn they often pause at Canada’s Fraser River Delta to hunt shorebirds. Pacificnorthwestkate (@pnwkate) filmed one working a sandpiper flock at Roberts Bank.

Peregrines on the hunt hope to separate a single bird from the crowd because they cannot catch anything in such a tight flock. When a lone bird can’t keep up it becomes the peregrine’s dinner.

Flock of dunlin (photo from Wikimedia Commons)

Dunlin flocking behavior on the Pacific Coast changed after the peregrine population recovered in the 1990s. A study at the Fraser River Delta in 2009 found that dunlin quickly learned it was unsafe to roost at high tide during the day because peregrines were on patrol. Instead they began to spend high tide flocking over the open ocean, flying continuously for three to five hours.

A new study, published this month in Phys.org, looked at the interaction from the peregrines’ perspective and found that the falcons haze the dunlin flocks to keep them moving. Peregrine hunting success improved at the end of those 3-5 hours of continuous flying because the dunlin had to stop for a rest.

The hunting data showed that dunlins were at greatest risk of predation just before and just after high tide, and spent most of the riskiest period flocking. However, there was a sharp increase in kills two hours after high tide, because the dunlins were not flocking despite elevated risk. [They were resting.]

phys.org: Peregrine falcons set off false alarms to make prey easier to catch, study finds

So the dunlin changed their behavior to avoid peregrine predation and the peregrines changed their behavior to wear out the dunlin. Peregrines have more stamina that dunlin.

Read more about the peregrines’ hunting strategy at Phys.org: Peregrine falcons set off false alarms to make prey easier to catch, study finds.

(credits and links are in the captions)

Peregrines Together in September

Ecco watches while Carla preens, 15 Sep 2023, 3:54pm

16 September 2023

Yesterday Ecco and Carla spent lots of time hanging out together at the Pitt peregrine nest. The snapshot camera’s motion detector captured their activity.

Beginning at 3:50pm the pair spent 45 minutes together, bowing, preening, and watching. When Ecco left, Carla continued on the perch for another half hour, then stretched and departed at 5:00pm.

Two minutes later Ecco landed at the exact same spot on the perch. Because female peregrines are larger than males, the switch from Carla to Ecco made it look as if the bird shrank.

Ecco preened for more than an hour, then stretched and vaulted up to leave at 6:13pm. All told, the peregrines were present on camera for nearly 2.5 hours.

This slideshow shows 144 minutes of their interactions in only 1 minute and 15 seconds. If you miss the captions on the first pass, don’t worry, the slideshow repeats.

(photos from the National Aviary snapshot falconcam at Univ of Pittsburgh)

Out of Sight, But Not Out of Mind

Ecco and Carla bow at the nest, 31 August 2023, 4:17pm (photo from the National Aviary snapshot camera at Univ of Pittsburgh)

1 September 2023

The National Aviary’s streaming camera is off for the season so the Pitt peregrines are virtually out of sight, but they are not off my mind. Every day I check the Cathedral of Learning’s ledges to see where they’re perched and I look at the snapshot camera in case they’ve been to the nest.

Activity at the nest picked up this week because fall is coming and migration is underway. The length of day is similar to spring and they’re taking an interest in songbird migration as prey flies overhead at night.

Ecco and Carla bowed at the nest three times yesterday, including an extended bowing session, to strengthen their pair bond and their claim on the nest.

All of Pitt’s resident peregrines(*) stay home for the winter and I expect Ecco and Carla to do the same. They don’t need to migrate because there’s plenty of food in the winter (pigeons and starlings) and their “cliff” is too valuable to lose by vacating it for six months.

So I’m still watching. The Pitt peregrines may be out of sight but they are not out of my mind.

(*) There’s a lot of history that allows me to say that. Peregrines have lived at the Cathedral of Learning for 22 years, spanning 8 adult birds.

(photos from the National Aviary snapshot camera at Univ of Pittsburgh)